Being newly re-interested in lego and getting my first ever lego trains, owning the 9v, rc and power funtions, I can only say, we have the best of all worlds.
There is still plenty off 9v stuff on brick link / ebay at reasonable prices, I saw a mostly complete 9v set sell tonight including postage for £51.00, I lost by £1 (but to stick pf in a train costs this much) I think we forget that ebay does have bargains and tho its used it's not bad really, tlc could do better they promised more track choices with plastic track and have stopped making the only new piece of the double switch so they have let us down, flexible track has only limited use for most.
with the internet providing inspiration and availability of new and old parts we have it pretty good, but tlc need to do something great next or it might go a bit pear shaped, there are a lot of cheap building blocks out there and lego need to watch there prices, I mean work out a maersk, pf set with light's and lipo battery, charger, and track!!!!!!! thats one expensive train set.
so is it a golden age, i suppose it depends what you want from your trains for me it seams good, just need more money....